UK Police chief confirms that the arrests made are significant and their search has uncovered key evidence.

Chief constable Ian Hopkins said that the 8 people being held by the police were significant arrests

Manchester: British police have made significant arrests and have uncovered important items as they investigate a suicide bomb attack which killed 22 at a music concert in Manchester, the head of the city's police said.

Greater Manchester police are holding eight people in custody, having released a woman without charge on Thursday.

"I want to reassure people that the arrests that we have made are significant, and initial searches of premises have revealed items that we believe are very important to the investigation," police chief Ian Hopkins told reporters.